content: /*******************************************************************************
   * Copyright 2011, 2012 Chris Banes.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *******************************************************************************/
  package com.handmark.pulltorefresh.library.internal;
  
  import android.annotation.SuppressLint;
  import android.content.Context;
  import android.graphics.Matrix;
  import android.graphics.drawable.Drawable;
  import android.view.View;
  import android.view.animation.Animation;
  import android.view.animation.Animation.AnimationListener;
  import android.view.animation.AnimationUtils;
  import android.view.animation.Interpolator;
  import android.view.animation.LinearInterpolator;
  import android.view.animation.RotateAnimation;
  import android.widget.FrameLayout;
  import android.widget.ImageView;
  import android.widget.ImageView.ScaleType;
  
  import com.handmark.pulltorefresh.library.PullToRefreshBase;
  import com.handmark.pulltorefresh.library.R;
  
  @SuppressLint("ViewConstructor")
  public class IndicatorLayout extends FrameLayout implements AnimationListener {
  
  	static final int DEFAULT_ROTATION_ANIMATION_DURATION = 150;
  
  	private Animation mInAnim, mOutAnim;
  	private ImageView mArrowImageView;
  
  	private final Animation mRotateAnimation, mResetRotateAnimation;
  
  	public IndicatorLayout(Context context, PullToRefreshBase.Mode mode) {
  		super(context);
  		mArrowImageView = new ImageView(context);
  
  		Drawable arrowD = getResources().getDrawable(R.drawable.indicator_arrow);
  		mArrowImageView.setImageDrawable(arrowD);
  
  		final int padding = getResources().getDimensionPixelSize(R.dimen.indicator_internal_padding);
  		mArrowImageView.setPadding(padding, padding, padding, padding);
  		addView(mArrowImageView);
  
  		int inAnimResId, outAnimResId;
  		switch (mode) {
  			case PULL_FROM_END:
  				inAnimResId = R.anim.slide_in_from_bottom;
  				outAnimResId = R.anim.slide_out_to_bottom;
  				setBackgroundResource(R.drawable.indicator_bg_bottom);
  
  				// Rotate Arrow so it's pointing the correct way
  				mArrowImageView.setScaleType(ScaleType.MATRIX);
  				Matrix matrix = new Matrix();
  				matrix.setRotate(180f, arrowD.getIntrinsicWidth() / 2f, arrowD.getIntrinsicHeight() / 2f);
  				mArrowImageView.setImageMatrix(matrix);
  				break;
  			default:
  			case PULL_FROM_START:
  				inAnimResId = R.anim.slide_in_from_top;
  				outAnimResId = R.anim.slide_out_to_top;
  				setBackgroundResource(R.drawable.indicator_bg_top);
  				break;
  		}
  
  		mInAnim = AnimationUtils.loadAnimation(context, inAnimResId);
  		mInAnim.setAnimationListener(this);
  
  		mOutAnim = AnimationUtils.loadAnimation(context, outAnimResId);
  		mOutAnim.setAnimationListener(this);
  
  		final Interpolator interpolator = new LinearInterpolator();
  		mRotateAnimation = new RotateAnimation(0, -180, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
  				0.5f);
  		mRotateAnimation.setInterpolator(interpolator);
  		mRotateAnimation.setDuration(DEFAULT_ROTATION_ANIMATION_DURATION);
  		mRotateAnimation.setFillAfter(true);
  
  		mResetRotateAnimation = new RotateAnimation(-180, 0, Animation.RELATIVE_TO_SELF, 0.5f,
  				Animation.RELATIVE_TO_SELF, 0.5f);
  		mResetRotateAnimation.setInterpolator(interpolator);
  		mResetRotateAnimation.setDuration(DEFAULT_ROTATION_ANIMATION_DURATION);
  		mResetRotateAnimation.setFillAfter(true);
  
  	}
  
  	public final boolean isVisible() {
  		Animation currentAnim = getAnimation();
  		if (null != currentAnim) {
  			return mInAnim == currentAnim;
  		}
  
  		return getVisibility() == View.VISIBLE;
  	}
  
  	public void hide() {
  		startAnimation(mOutAnim);
  	}
  
  	public void show() {
  		mArrowImageView.clearAnimation();
  		startAnimation(mInAnim);
  	}
  
  	@Override
  	public void onAnimationEnd(Animation animation) {
  		if (animation == mOutAnim) {
  			mArrowImageView.clearAnimation();
  			setVisibility(View.GONE);
  		} else if (animation == mInAnim) {
  			setVisibility(View.VISIBLE);
  		}
  
  		clearAnimation();
  	}
  
  	@Override
  	public void onAnimationRepeat(Animation animation) {
  		// NO-OP
  	}
  
  	@Override
  	public void onAnimationStart(Animation animation) {
  		setVisibility(View.VISIBLE);
  	}
  
  	public void releaseToRefresh() {
  		mArrowImageView.startAnimation(mRotateAnimation);
  	}
  
  	public void pullToRefresh() {
  		mArrowImageView.startAnimation(mResetRotateAnimation);
  	}
  
  }
  